We had to splash in the water a little bit after all the excavation work. "The Pit" holds maybe 100-125 gallons of water. Underneath, we had already taken care to soak down the sandy loam before laying down the plastic liner. So in a short few minutes we had a nice cool wading pool to work in. You can do the fill step last if you want, it was just hot enough that it made more sense to have all that cool water under us while we worked.